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T. ZINOK. SELF RBGULATING TENSION FOR SEWING MACHINES, 8:0.

No. 60,456. Patented Dec. 11, 1866..

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IMPROVEMENT IN SELF-REGULATING TENSION FOR SEWING MACHINES-etc.

THEODORE ZINCK, OF NEW' YORK, N. Y., ASSIGNOR TO HIMSELF AND f F. W.KALBFLEISCH, OF SAME PLACE Letters Patent .No. 60,456, dated December11, 1866.

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, THEODORE ZINCK, of 181 Water street, in the city,county and State of New York, have invented a new and ImprovedSelf-Regulating Tension; and I do hereby declare that the following is afull,

clear and exact description thereof, which will enable others skilled inthe art to make and use the same, reference being had to theaccompanying drawings, forming a part of this specification, in which-Figure 1 represents a side elevation of this invention.

' Figure 2 is a front elevation of the same.

Similar letters of reference indicate like parts.

This invention relates to a tension, which isapplicable to the thread ofsewing machines, or to ropes; telegraph cables, or to other strandswhich are wound off from a bobbin, and the tension of which is to bekept as near as possible uniform. Said tension consists of a frictionspring, bearing on the bobbin from which the thread or strand is to beunwound, in combination with an arm, which is secured to the spring, andover which the thread or strand passes in such a manner that whenever,from any cause whatever, the tension of said strand increases, thefriction spring is forced back and the bobbin is relieved, and by thesemeans the tension is equalized and rendered self-regulating. Arepresents a bobbin from which the thread a is taken. Said bobbin turnsfreely on a pin or axle b, and it is exposed to the action of thefriction spring B, which bears on the surface of the thread, or on thecircumference of the bobbin, and which acts as a check on said bobbin,so that a certain strain on the thread is required to turn said bobbin.A set serewf serves to regulate the strain of the spring. Fromthe'spring B extends an arm C, which is curved and bent, so that its endextends parallel to the axis of the bobbin, and on the opposite side ofthe spring, as clearly shown in the drawing. The thread, on being takenfrom the bobbin, is passed over the end of said arm, and if the tensionof the thread increases beyond the desired point from some cause, forinstance, if the bobbin catches so that it cannot revolve with its usualfreedom, the spring B is freed off from the bobbin, and by releasing thesame the tension is rendered self-regulating. This tension is intendedparticularly for sewing machines, but it can be used with advantage inall cases where it is desirable to unwind from a bobbin a thread, cord,rope, cable, or other strand.

Having thus described my invention, I claim as new, and desire to secureby Letters Patent The arm O, in combination with the friction spring Band bobbin A, constructed and operating substantially as and for thepurpose described.

7 THEODORE ZINOK. Witnesses:

J as. A. Sal-tries, W. Haurr.

